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Hovering over the device doesn't show the battery level. When connected to the iPhone, I was able to get the battery level in the widgets screen.

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How do I know when I have to charge the headphones?

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4 Answers 4

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You can write your custom script on these lines

https://romig.dev/blog/mac-os-quirks-bluetooth-device-battery-low/ using ioreg I/O Registry, code for a implementation is available here on Github https://github.com/aromig/scripts/tree/master/check_battery

You can also use plugins like Akku https://github.com/jariz/Akku

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    While this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. Link-only answers can become invalid if the linked page changes or disappears.
    – Glorfindel
    Sep 26, 2020 at 17:46
  • modified to include github code link in case the main blog vanishes. ioreg reference should help point in right direction, thanks for feedback @Glorfindel Sep 29, 2020 at 8:10
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MacOS Monterey now supports 3rd party Bluetooth headsets by itself. This was the reason for plugins like Akku being discontinued.

Try to upgrade your OS.

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This is not something built into macOS.

To get alerts and notifications about your Bluetooth devices’ battery status, you need a third party utility like MenuBar Stats.

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On the latest updates of mac os (I have mac os 12.1) you can check the battery of bluetooth-connected devices in the Bluetooth menubar icon:

Bluetooth menubar icon

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